Building roof vent fixture



FIG. 1 is a right oblique perspective view of a building roof vent fixture of my new design;

FIG. 2 is a top view of the vent fixture;

FIG. 3 is a right side view of the vent fixture, the left side being opposite;

FIG. 4 is a front view of the vent fixture;

FIG. 5 is a rear view of the vent fixture; and,

FIG. 6 is a bottom view of the vent fixture. 

I claim the ornamental design for a building roof vent fixture, as shown. 